2018 VOLVO V90 engine

MAINTENANCE AND SERVICE
592
Support battery In addition to the start battery, vehicles equipped with the Start/Stop function also have a supportbattery.
Vehicles with the Start/Stop function are equip- ped with two 12-volt batteries ‒ a heavy-duty
start battery and a support battery that provides extra current during the Start/Stop function'sstart sequence.
The support battery is located in a box next to the spring strut in the engine compartment.
NOTE
• The higher the current consumption in the vehicle, the more the alternator has towork and the batteries have to becharged = increased fuel consumption.
• When the starter battery capacity hasdropped below the lowest permissiblelevel, the Start/Stop function is disen-gaged.
When the Start/Stop function is temporarily reduced due to high current consumption:
• The engine will auto-start, even if the driverdoes not lift their foot from the brake pedal.
The support battery does not normally requiremore service than the start battery. If you have any questions or concerns, consult a workshop ‒
an authorized Volvo workshop is recommended.
CAUTION
If the following is not observed, the Start/ Stop function may temporarily stop workingafter connection of an external starter batteryor battery charger: • The negative battery terminal of the vehi- cle's starter battery must
never be used
to connect an external starter battery orbattery charger – only the vehicle's neg-
ative charging point should be used as
a grounding point.

MAINTENANCE AND SERVICE
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593
NOTE
If the starter battery is discharged to the extent that the vehicle does not have normalelectrical functions and the engine must thenbe jump-started with an external battery or abattery charger, the Start/Stop function mayremain activated. If the Start/Stop functionshortly thereafter auto-stops the engine, thereis a huge risk that auto-start of the engine willfail due to insufficient battery capacity sincethe battery had not had time to recharge. If the vehicle has been jump-started or if there has not been enough time for the bat-tery to be charged with a battery charger, it isadvisable to temporarily deactivate theStart/Stop function until the battery has beenrecharged by the vehicle. At an ambient tem-perature of about +15°C (about 60°F), thebattery must be charged by the vehicle for atleast one hour. At lower ambient tempera-tures, the charging time can increase to3-4 hours. It is advisable to charge the batterywith an external battery charger.
Specifications
Voltage (V) 12 Cold start capacityA
-
CCA B
(A) 170
Dimensions, L×W×H150×90×130 mm
(5.9×3.5×5.1 inches)
Capacity (Ah) 10
A According to EN standard.
B Cold Cranking Amperes.
CAUTION
When replacing the starter battery or support battery, an AGM 20
battery must be installed.
Related information
• Start battery (p. 589)
• Start/Stop function (p. 424)
• Battery symbols (p. 593)
Battery symbols
There are warning symbols and information on the batteries.
Wear protective goggles.
See the Owner's Manual for additional information.
Keep batteries away from children.
Batteries contain corrosive acid.
20Absorbed Glass Mat.

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MAINTENANCE AND SERVICE
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Avoid smoking, open
flames, and/or sparks.
Risk of explosion.
Recycle properly.
NOTE
A used start battery or backup battery con- tains lead and must be recycled in an environ-mentally responsible manner.
Related information
• Start battery (p. 589)
• Support battery (p. 592)
Fuses and fuseboxes
All electrical functions and components are pro- tected by a number of fuses in order to protectthe vehicle's electrical system from damage byshort circuiting or overloading.
WARNING
Never use a foreign object or a fuse with a higher amperage than that specified toreplace a fuse. This could cause significantdamage to the electrical system and possiblylead to a fire.
If any electrical component or function is not responding, the component may have blown afuse due to temporary overload. If the same fuseblows repeatedly, there may be a problem withthe component. Volvo recommends contacting anauthorized Volvo workshop to have the compo-nent checked.
Location of fuseboxes
The illustration is generic - appearance may vary accord- ing to vehicle model.
Engine compartment
Under the glove compartment
Trunk/cargo compartment
Related information
• Replacing fuses (p. 595)
• Fuses in the cargo compartment (p. 602)
• Fuses in the engine compartment (p. 596)
• Fuses under the glove compartment (p. 599)

MAINTENANCE AND SERVICE
595
Replacing fuses All electrical functions and components are pro- tected by a number of fuses in order to protectthe vehicle's electrical system from damage byshort circuiting or overloading.
1. Refer to the fuse diagram to locate the fuse.
2. Pull out the fuse and examine it from theside to determine if the curved metal wire in the fuse is intact.
3. If the wire is broken, replace the fuse with a new fuse of the same color and amperage.
WARNING
Never use a foreign object or a fuse with a higher amperage than that specified toreplace a fuse. This could cause significantdamage to the electrical system and possiblylead to a fire.
WARNING
Contact an authorized Volvo workshop for assistance replacing fuses not listed in theOwner's Manual. If performed incorrectly, sig-nificant damage can be caused to the electri-cal system.
Related information
• Fuses and fuseboxes (p. 594)
• Fuses in the cargo compartment (p. 602) •
Fuses in the engine compartment (p. 596)
• Fuses under the glove compartment (p. 599)

MAINTENANCE AND SERVICE
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Fuses in the engine compartment
The fuses in the engine compartment help pro- tect electrical components such as engine andbrake functions.

MAINTENANCE AND SERVICE
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* Option/accessory.597
Fuse pliers are provided on the inside of the fuse box cover to assist in removing and insertingfuses. There are also spaces for several extra fuses in the fusebox.
PositionsThere is a decal with a diagram of the locationsof the fuses on the inside of the cover.
• Fuses 1-13, 18-30, 35-37 and 46-54 are"Micro" fuses.
• Fuses 14-17, 31-34 and 38-45 are"MCase" fuses and should only be replaced by a workshop 21
.
FunctionAA
– –
– –
– –
Ignition coils (gasoline); spark plugs (gasoline) 15
Oil pump solenoid; A/C mag- netic coupling; heated oxygensensor, center (gasoline); heatedoxygen sensor, rear (diesel)15
FunctionAA
Vacuum regulators; valve; valve for power pulse (diesel)
7.5
Engine control module; actuator; throttle unit; EGR valve (diesel);turbo position sensor (diesel);turbocharger valve (gasoline) 20
Engine control module 5
– –
Solenoids (gasoline); valve; Engine cooling system thermo-stat (gasoline); EGR coolingpump (diesel); glow controlmodule (diesel)10
Spoiler shutter control module; Radiator shutter control module;Relay windings for power pulse(diesel)
5
Heated oxygen sensor, front; Heated oxygen sensor, rear(gasoline)
15
Engine control module 20
Starter motor 40
FunctionAA
Starter motor Shunt
Fuel filter heater (diesel) 30
– –
– –
– –
– –
– –
– –
– –
12 V outlet in tunnel console, front
15
12 V outlet in tunnel console between rear seats15
12 V outlet in trunk/cargo com- partment
* 15
– –
Left-side headlight, some mod- els with LED
B 15
21
An authorized Volvo workshop is recommended.

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MAINTENANCE AND SERVICE
* Option/accessory.
598
FunctionAA
Right-side headlight, some mod- els with LED B 15
– –
Heated windshield
*, left side Shunt
Heated windshield
*, left side 40
Headlight washers
*25
Windshield washer 25
Transmission control module 15
Horn 20
Alarm siren
* 5
Brake system control module (valves, parking brake) 40
Wipers 30
Rear window washer 25
Heated windshield
*, right side 40
Parking heater
* 20
Brake system control module (ABS pump) 40
FunctionAA
– –
Heated windshield
*, right side Shunt
Fed when ignition is on: engine control module, transmissioncomponents, electrical powersteering, central electrical mod-ule, brake system control mod-ule 5
– –
Right-side headlight 7.5 Right-side headlight, some mod- els with LED
B 15
– –
– –
Battery connection control mod- ule 5
Airbags 5
FunctionAA
Left-side headlight 7.5 Left-side headlight, some mod- els with LED
B 15
Accelerator pedal sensor 5
A
Ampere
B LED (Light Emitting Diode)
Related information
• Fuses and fuseboxes (p. 594)
• Replacing fuses (p. 595)

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MAINTENANCE AND SERVICE
* Option/accessory.
600 Fuse pliers are provided on the inside of the fuse box cover to assist in removing and insertingfuses. There are also spaces for several extra fuses in the
distribution box in the engine compart-
ment .
Positions
•Fuses 1, 3-21, 23-36, 39-53 and 55-59 are "Micro" fuses.
• Fuses 2-22, 37-38 and 54 are "MCase"fuses and should only be replaced by a work- shop 22
.
FunctionAA
– –
Electrical outlet in tunnel console between rear seats * 30
– –
Movement sensor
* 5
Media player 5
Instrument panel 5
Center console buttons 5
Sun sensor 5
FunctionAA
– –
– –
Steering wheel module 5
Module for start knob and parking brake controls 5
Heated steering wheel
* module 15
– –
– –
– –
– –
Climate system control module 10
– –
Data link connector OBD-II 10
Center display 5
Climate system blower module (front) 40
USB HUB 5
FunctionAA
Instrument lighting; Interior lighting; Rearview mirror auto-dim function
*;
Rain and light sensors *; Rear tun-
nel console keypad, rear seat *;
Power front seats *; Rear door con-
trol panels; Climate system blower module left/right 7.5
Control module for driver support functions
5
Panoramic roof with sun curtain
*20
Head-up display
* 5
Passenger compartment lighting 5
– –
Ceiling console display (seat belt reminder/front passenger side air-bag indicator) 5
– –
Humidity sensor 5
Door module in right-side rear door 20
Fuses in the trunk/cargo compart- ment
10
22
An authorized Volvo workshop is recommended.